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Goodwill (Tables) | 12 Months Ended
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Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the year ended September 30, 2019 are as follows (in thousands):
|  | Semiconductor |  |  | SiC/LED |  |  | Automation |  |  | Net Goodwill - Continuing Operations |  |  | Discontinued Operations |  |  | Net Goodwill |
Goodwill |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | 3,595 |  |  | $ | 10,228 |  |  | $ | 3,367 |  |  | $ | 13,595 |
Accumulated impairment losses |  |  | — |  |  |  | — |  |  |  | (3,595 | ) |  |  | (3,595 | ) |  |  | (3,367 | ) |  |  | (6,962 | )
Balance at September 30, 2018 |  |  | 5,905 |  |  |  | 728 |  |  |  | — |  |  |  | 6,633 |  |  |  | — |  |  |  | 6,633 |
Impairment of goodwill |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance at September 30, 2019 |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | — |  |  | $ | 6,633 |  |  | $ | — |  |  | $ | 6,633 |
Goodwill |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | 3,595 |  |  | $ | 10,228 |  |  | $ | 3,367 |  |  | $ | 13,595 |
Accumulated impairment losses |  |  | — |  |  |  | — |  |  |  | (3,595 | ) |  |  | (3,595 | ) |  |  | (3,367 | ) |  |  | (6,962 | )
Balance at September 30, 2019 |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | — |  |  | $ | 6,633 |  |  | $ | — |  |  | $ | 6,633 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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